<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            height: 100px;
            width: 100px;
            /* background-color: rgb(255, 0, 0); */
            /* hsl(色调,饱和度,亮度) */
            /* background-color: hsl(360, 100%, 50%); */
            background-color: #0094ff;
        }
    </style>
</head>
<body>
    <div class="box"></div>
</body>
</html>